210111212112121 has 4 divisors (see below), whose sum is σ = 210119498260132. Its totient is φ = 210102925964112.

The previous prime is 210111212112097. The next prime is 210111212112233. The reversal of 210111212112121 is 121211212111012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127373796000000 + 82737416112121 = 11286000^2 + 9096011^2 .

It is a cyclic number.

It is not a de Polignac number, because 210111212112121 - 2³⁵ = 210076852373753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210111212112421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4143035970 + ... + 4143086683.

It is an arithmetic number, because the mean of its divisors is an integer number (52529874565033).

Almost surely, 2^{210111212112121} is an apocalyptic number.

It is an amenable number.

210111212112121 is a deficient number, since it is larger than the sum of its proper divisors (8286148011).

210111212112121 is an equidigital number, since it uses as much as digits as its factorization.

210111212112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8286148010.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 210111212112121 its reverse (121211212111012), we get a palindrome (331322424223133).

The spelling of 210111212112121 in words is "two hundred ten trillion, one hundred eleven billion, two hundred twelve million, one hundred twelve thousand, one hundred twenty-one".